Hertz
The hertz or hertz (symbol Hz) is the unit of frequency of the International System of Units.
Definition
Named after the German physicist Heinrich Rudolf Hertz (1857-1894), who discovered the propagation of electromagnetic waves. The name was established by the International Electrotechnical Commission (IEC) in 1930. This was adopted in 1960 by the CGPM (Conférence Générale des Poids et Mesures: General Conference on Weights and Measures), replacing the previous name of cps (cycles per second), as well as their related multiples:
- kc/s (kilocicles per second),
- Mc/s (megacycles per second), and
- Gc/s (gigacycle per second).
The term cycle per second was completely replaced by hertz in the 1970s. It is also used in sine curves, which represent sound waves.
One hertz represents one cycle per second, understanding cycle as the repetition of an event. For example, the hertz is applied in physics to the measurement of the number of times per second that a wave (whether sound or electromagnetic) is repeated or it can also be applied, among other uses, to sea waves that reach the beach per second or to the vibrations of a solid. The magnitude that the hertz measures is called frequency and is, in this sense, the inverse of the period. One hertz is the frequency of an oscillation that a particle undergoes in a period of one second.
f=1T=Hz=s− − 1=1s{displaystyle f={frac {1}{T}}}=mathrm {Hz=s^{1}={frac {1}{s}}}} }
The conversion between a frequency f{displaystyle f} measured in hertz and angular speed ω ω {displaystyle omega } radian measurement per second is
- ω ω =2π π f{displaystyle omega =2pi f,} and f=ω ω 2π π {displaystyle f={frac {omega }{2pi }}{,}
Multiples of Hertz
The following is a table of the multiples and submultiples of the SI (International System of Units).
| Submultiplos | Multiple | |||||
|---|---|---|---|---|---|---|
| Value | Symbol | Name | Value | Symbol | Name | |
| 10−1 Hz | dHz | decihertz | 101 Hz | daHz | decahercio | |
| 10−2 Hz | cHz | centihertz | 102 Hz | hHz | hectohertz | |
| 10−3 Hz | mHz | millihertz | 103 Hz | kHz | kilohertz | |
| 10−6 Hz | μHz | microhertz | 106 Hz | MHz | megahertz | |
| 10−9 Hz | nHz | nanohertz | 109 Hz | GHz | gigahertz | |
| 10−12 Hz | pHz | picohercio | 1012 Hz | THz | terahercio | |
| 10−15 Hz | fHz | femtohercio | 1015 Hz | PHz | petahercio | |
| 10−18 Hz | aHz | Attohertz | 1018 Hz | EHz | exahertz | |
| 10−21 Hz | z | zeptohertz | 1021 Hz | ZHz | zettahercio | |
| 10−24 Hz | and Hz | Ictohercio | 1024 Hz | YHz | Yottahercio | |
| 10−27 Hz | rHz | redhearted | 1027 Hz | RHz | ronnahercio | |
| 10−30 Hz | qHz | Quectohercio | 1030 Hz | QHz | quettahercio | |
| The most common prefixes are in bold. | ||||||
This unity of the International System is named in honor of Heinrich Rudolf Hertz. In the units of the SI whose name comes from a person's own name, the first letter of the symbol is written with capital (Hz), while his name always starts with a tiny letter (hertz), except in case you start a sentence or a title.Based on The International System of UnitsSection 5.2.